import sequtils,strutils,algorithm,tables
let n = stdin.readLine().parseInt()
var B = toSeq(newSeqWith(n,stdin.readLine()).sorted(cmp).toCountTable().values).sorted(cmp)
while true:
  B = B.sorted(cmp)
  B[^1] -= 1
  B[^2] -= 1
  if B[^1] < 0 : quit "NO",0
  if B[^2] == 0 and B[^1] <= 1 : quit "YES",0